refactor(types): remove dead catch-all clauses unreachable per success typing

lib/mv_web/controllers/auth_controller.ex

@@ -335,8 +335,6 @@ defmodule MvWeb.AuthController do
     end
   end
 
-  defp redact_url(_), do: "[redacted]"
-
   def sign_out(conn, _params) do
     conn = clear_session(conn, :mv) |> put_flash(:success, gettext("You are now signed out"))